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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e68275251384fc0bdfbebeb91a5aa6fdc1530ad52990ed03dbf39f53a6dfad3b' 
  AND token = 'H8ADeh+iSvBX8wTAF4qJRQG5qm2ysh7daXU3e7Vkhdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}